--- a/mainwindow.h	Sun Jan 29 10:41:36 2012 +0100
+++ b/mainwindow.h	Sun Jan 29 10:52:57 2012 +0100
@@ -18,6 +18,7 @@
    ~MainWindow();
 
   public slots:
+   void about() const;
    void open(const QString& = "");
 
   private: